Custom-made for the Promaster wheel size, this lock is a combination of a Gorilla lock and key with a 4130 Steel, CNC turned and nickel plated, threaded stud. This lock provides extra security for your stock or aftermarket spare wheel. Spinning collar and recessed key makes this a challenge to try to remove. Sold as singles and not recommended for driving wheel locations, spare only. It is is male bolt style, not a nut and is M16-1.5. This is designed solely for use with the Landed Gear Spare Tire Carrier.